DRE approaches for quality approach - Software Process Improvement

Q.  A quality objective for a software team is achieve in how many DRE approaches?
- Published on 24 Jul 15

a. 2
b. 3
c. 1
d. 4

ANSWER: 1
 

    Discussion

  • Nirja Shah   -Posted on 26 Oct 15
    Defect Removal Efficiency

    - A quality metric that provides benefit at both the project and process level is defect removal efficiency (DRE).

    - It is a measure of the filtering ability of quality assurance and control activities as they are applied throughout all process framework activities. To compute DRE:
    DRE = E / (E + D)

    - Where E= no. of error before release and D = defect found after release of software to end users

    - 1 is the ideal value for DRE.

    - That is, no defects are found in the software.

    - Realistically, 0 will be greater than D, but the value of DRE can still approach 1.

    - As E increases (for a given value of D), the overall value of DRE begins to approach 1.

    - In fact, the final value of D will decrease as E increases (errors are filtered out before they become defects).

    - DRE encourages a software project team to institute techniques for finding as many errors as possible before delivery.

    - It can also be used within the project to assess a team’s ability to find errors before they are passed to the next framework activity or software engineering task.

    - For example, the requirements analysis task produces an analysis model that can be reviewed to find and correct errors.

    - Those errors that are not found during the review of the analysis model are passed on to the design task.
    When used in this context, we redefine DRE as
    DREi = Ei/(Ei + Ei+1)

    - Ei is the number of errors found during software engineering activity i.

    - Ei+1 number of errors found during software engineering activity i+1

    - A quality objective for a software team is to achieve DREi that approaches 1.

    - That is, errors should be filtered out before they are passed on to the next activity.

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